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      使用uil为ListView加载图片
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        <p>一个简单的Listview，然后里面item就是一张图片，希望很流畅的加载网络图片，然后滑动的时候不会出现卡顿，也不会出现OOM现象。<br>在断开网络连接的时候，点击listview的item，进入到图片详情界面，依旧能够加载出完整的图片。  </p>
<span id="more"></span>    

<hr>
<p>Universal-Image-Loader，一个强大的图片加载框架，具有以下的特性：   </p>
<p>1.多线程下载图片，图片可以来源于网络，文件系统，项目文件夹assets中以及drawable中等<br>2.支持随意的配置ImageLoader，例如线程池，图片下载器，内存缓存策略，硬盘缓存策略，图片显示选项以及其他的一些配置<br>3.支持图片的内存缓存，文件系统缓存或者SD卡缓存<br>4.支持图片下载过程的监听<br>5.根据控件(ImageView)的大小对Bitmap进行裁剪，减少Bitmap占用过多的内存<br>6.较好的控制图片的加载过程，例如暂停图片加载，重新开始加载图片，一般使用在ListView,GridView中，滑动过程中暂停加载图片，停止滑动的时候去加载图片<br>7.提供在较慢的网络下对图片进行加载     </p>
<h4 id="一-新建工程-前期工作处理好-参考上篇"><a href="#一-新建工程-前期工作处理好-参考上篇" class="headerlink" title="一 新建工程,前期工作处理好,参考上篇"></a>一 新建工程,前期工作处理好,参考上篇</h4><p>1 下载jar包,导入工程    </p>
<p><a target="_blank" rel="noopener" href="https://github.com/nostra13/Android-Universal-Image-Loader">原作者Github下载</a>    /downloads/universal-image-loader-1.9.5.jar<br><a target="_blank" rel="noopener" href="http://oss.wxyass.com/wxyass/jar/universal-image-loader-1.9.5.jar">个人备份下载</a>  universal-image-loader-1.9.5.jar    </p>
<p>2 创建MyApplication类,配置参数    </p>
<pre><code>import android.app.Application;
import android.graphics.Bitmap;
import android.os.Environment;
import android.os.Handler;

import com.nostra13.universalimageloader.cache.disc.impl.UnlimitedDiskCache;
import com.nostra13.universalimageloader.cache.disc.naming.HashCodeFileNameGenerator;
import com.nostra13.universalimageloader.cache.memory.impl.LruMemoryCache;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import com.nostra13.universalimageloader.core.assist.ImageScaleType;
import com.nostra13.universalimageloader.core.assist.QueueProcessingType;
import com.nostra13.universalimageloader.core.decode.BaseImageDecoder;
import com.nostra13.universalimageloader.core.display.SimpleBitmapDisplayer;
import com.nostra13.universalimageloader.core.download.BaseImageDownloader;

import java.io.File;

/**
 * Created by wxyass.
 */
public class MyApplication extends Application &#123;

    private MyApplication instance;
    @Override
    public void onCreate() &#123;
        super.onCreate();
        instance = this;
        initImageloader();
    &#125;

    public void initImageloader() &#123;
        DisplayImageOptions options = new DisplayImageOptions.Builder()
                .showImageOnLoading(R.drawable.ic_download)
                .showImageOnFail(R.drawable.ic_download)
                .resetViewBeforeLoading(false) // default
                .delayBeforeLoading(0).cacheInMemory(true) // default
                .cacheOnDisk(true) // default
                .considerExifParams(true) // default
                .imageScaleType(ImageScaleType.IN_SAMPLE_POWER_OF_2) // default
                .bitmapConfig(Bitmap.Config.ARGB_8888) // default
                .displayer(new SimpleBitmapDisplayer()) // default
                .handler(new Handler()) // default
                .build();

        File picPath = new File(Environment.getExternalStorageDirectory()
                .getPath()+ File.separator+ &quot;MyDemo&quot;+ File.separator+ &quot;files&quot;);
        ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(
                getApplicationContext())
                .memoryCacheExtraOptions(480, 800)
                // default = device screen dimensions
                .diskCacheExtraOptions(480, 800, null)
                .threadPoolSize(3)
                // default
                .threadPriority(Thread.NORM_PRIORITY - 1)
                // default
                .tasksProcessingOrder(QueueProcessingType.FIFO)
                // default
                .denyCacheImageMultipleSizesInMemory()
                .memoryCache(new LruMemoryCache(2 * 1024 * 1024))
                .memoryCacheSize(2 * 1024 * 1024)
                .memoryCacheSizePercentage(13)
                // default
                .diskCache(new UnlimitedDiskCache(picPath))
                // default
                .diskCacheSize(50 * 1024 * 1024)
                .diskCacheFileCount(1000)
                .diskCacheFileNameGenerator(new HashCodeFileNameGenerator())
                // default
                .imageDownloader(
                        new BaseImageDownloader(getApplicationContext())) // default
                .imageDecoder(new BaseImageDecoder(true)) // default
                .defaultDisplayImageOptions(options) // default
                .writeDebugLogs().build();
        ImageLoader.getInstance().init(config);
    &#125;
&#125;
</code></pre>
<p>3 添加权限<br>4 修改清单文件中application的name属性    </p>
<pre><code>&lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
&lt;manifest xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
          package=&quot;com.wxyass.tplistviewbyuil&quot;&gt;

    &lt;uses-permission android:name=&quot;android.permission.INTERNET&quot;/&gt;
    &lt;uses-permission android:name=&quot;android.permission.WRITE_EXTERNAL_STORAGE&quot;/&gt;
    &lt;uses-permission android:name=&quot;android.permission.READ_EXTERNAL_STORAGE&quot;/&gt;

    &lt;application
        android:name=&quot;.MyApplication&quot;
        android:allowBackup=&quot;true&quot;
        android:icon=&quot;@mipmap/ic_launcher&quot;
        android:label=&quot;@string/app_name&quot;
        android:roundIcon=&quot;@mipmap/ic_launcher_round&quot;
        android:supportsRtl=&quot;true&quot;
        android:theme=&quot;@style/AppTheme&quot;&gt;
        &lt;activity android:name=&quot;.MainActivity&quot;&gt;
            &lt;intent-filter&gt;
                &lt;action android:name=&quot;android.intent.action.MAIN&quot;/&gt;

                &lt;category android:name=&quot;android.intent.category.LAUNCHER&quot;/&gt;
            &lt;/intent-filter&gt;
        &lt;/activity&gt;
        &lt;activity android:name=&quot;.ImageActivity&quot;
            android:screenOrientation=&quot;portrait&quot; /&gt;
    &lt;/application&gt;
&lt;/manifest&gt;
</code></pre>
<h4 id="二-工程整体目录-如图"><a href="#二-工程整体目录-如图" class="headerlink" title="二 工程整体目录,如图"></a>二 工程整体目录,如图</h4><p><img src="http://images.wxyass.com/wxyass/images/20170706143244.png">   </p>
<h4 id="三-创建ListView的适配器"><a href="#三-创建ListView的适配器" class="headerlink" title="三 创建ListView的适配器"></a>三 创建ListView的适配器</h4><pre><code>import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;

import com.nostra13.universalimageloader.core.ImageLoader;

/**
 * Created by wxyass.
 */

public class ImgListAdapter extends BaseAdapter &#123;

    private Context context;
    private LayoutInflater layoutinflater;
    private String[] imageUrls;

    public ImgListAdapter(String[] urls, Context context) &#123;
        this.context = context;
        this.imageUrls = urls;
        this.layoutinflater = LayoutInflater.from(context);
    &#125;

    @Override
    public int getCount() &#123;
        return imageUrls.length;
    &#125;

    @Override
    public Object getItem(int position) &#123;
        return position;
    &#125;

    @Override
    public long getItemId(int id) &#123;
        return id;
    &#125;

    @Override
    public View getView(int position, View convertView, ViewGroup viewGroup) &#123;
        ViewHolder holder;
        if (convertView == null) &#123;
            holder = new ViewHolder();
            convertView = layoutinflater.inflate(R.layout.img_item, null);
            holder.webImg = (ImageView) convertView.findViewById(R.id.img);
            convertView.setTag(holder);
        &#125; else &#123;
            holder = (ViewHolder) convertView.getTag();
        &#125;
        // 通过ImageLoader来获取网络图片
        ImageLoader.getInstance().displayImage(imageUrls[position], holder.webImg);
        return convertView;
    &#125;

    class ViewHolder &#123;
        public ImageView webImg;
    &#125;
&#125;  
</code></pre>
<h5 id="3-1-附上listview条目布局"><a href="#3-1-附上listview条目布局" class="headerlink" title="3.1 附上listview条目布局"></a>3.1 附上listview条目布局</h5><pre><code>&lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
&lt;RelativeLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
                android:id=&quot;@+id/ll_indexstatus_dialog&quot;
                android:layout_width=&quot;match_parent&quot;
                android:layout_height=&quot;match_parent&quot;
    &gt;

    &lt;ImageView
        android:id=&quot;@+id/img&quot;
        android:layout_width=&quot;wrap_content&quot;
        android:layout_height=&quot;150dp&quot;
        android:layout_centerHorizontal=&quot;true&quot;
        /&gt;
&lt;/RelativeLayout&gt;  
</code></pre>
<h4 id="四-修改MainActivity代码-为ListView加载图片"><a href="#四-修改MainActivity代码-为ListView加载图片" class="headerlink" title="四 修改MainActivity代码,为ListView加载图片"></a>四 修改MainActivity代码,为ListView加载图片</h4><pre><code>import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;

import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.listener.PauseOnScrollListener;

public class MainActivity extends AppCompatActivity &#123;

    ListView listview;
    ImgListAdapter adapter;
    String[] imageuil = new String[]&#123;&quot;http://oss.wxyass.com/private/images/001/Pic_000042.jpg&quot;,
            &quot;http://oss.wxyass.com/private/images/001/Pic_000045.jpg&quot;,
            &quot;http://oss.wxyass.com/private/images/001/Pic_000051.jpg&quot;,
            &quot;http://oss.wxyass.com/private/images/001/Pic_000056.jpg&quot;,
            &quot;http://oss.wxyass.com/private/images/001/Pic_000061.jpg&quot;,
            &quot;http://oss.wxyass.com/private/images/001/Pic_000067.jpg&quot;,
            &quot;http://oss.wxyass.com/private/images/001/Pic_000071.jpg&quot;,
            &quot;http://oss.wxyass.com/private/images/001/Pic_000076.jpg&quot;,
            &quot;http://oss.wxyass.com/private/images/001/Pic_000077.jpg&quot;,
            &quot;http://oss.wxyass.com/private/images/001/Pic_000080.jpg&quot;,
            &quot;http://oss.wxyass.com/private/images/001/Pic_000085.jpg&quot;&#125;;

    @Override
    protected void onCreate(Bundle savedInstanceState) &#123;
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        listview = (ListView) findViewById(R.id.listview);
        adapter = new ImgListAdapter(imageuil, getApplicationContext());
        listview.setAdapter(adapter);
        /* PauseOnScrollListener这个类来控制ListView,GridView滑动过程中停止去加载图片.
        第一个参数就是我们的图片加载对象ImageLoader,
        第二个是控制是否在滑动过程中暂停加载图片，如果需要暂停传true就行了，
        第三个参数控制猛的滑动界面的时候图片是否加载。*/
        listview.setOnScrollListener(new PauseOnScrollListener(ImageLoader.getInstance(), false, true));
        // listview条目的点击事件
        listview.setOnItemClickListener(new AdapterView.OnItemClickListener() &#123;
            @Override
            public void onItemClick(AdapterView&lt;?&gt; parent, View view, int position, long id) &#123;
                Intent intent = new Intent(getApplicationContext(), ImageActivity.class);
                intent.putExtra(&quot;url&quot;, imageuil[position]);
                startActivity(intent);
            &#125;
        &#125;);
    &#125;
&#125;
</code></pre>
<h5 id="4-1-附上MainActivity的布局"><a href="#4-1-附上MainActivity的布局" class="headerlink" title="4.1 附上MainActivity的布局"></a>4.1 附上MainActivity的布局</h5><pre><code>&lt;RelativeLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
                xmlns:tools=&quot;http://schemas.android.com/tools&quot;
                android:layout_width=&quot;match_parent&quot;
                android:layout_height=&quot;match_parent&quot;
                 &gt;
    &lt;ListView
        android:id=&quot;@+id/listview&quot;
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;match_parent&quot;
        android:layout_marginBottom=&quot;10dp&quot;
        android:descendantFocusability=&quot;beforeDescendants&quot;
        android:dividerHeight=&quot;1dp&quot;
        android:footerDividersEnabled=&quot;false&quot; /&gt;

&lt;/RelativeLayout&gt;  
</code></pre>
<h4 id="五-修改图片详情界面代码-处理item传递过来的数据"><a href="#五-修改图片详情界面代码-处理item传递过来的数据" class="headerlink" title="五 修改图片详情界面代码,处理item传递过来的数据"></a>五 修改图片详情界面代码,处理item传递过来的数据</h4><pre><code>import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ImageView;
import com.nostra13.universalimageloader.core.ImageLoader;

public class ImageActivity extends AppCompatActivity &#123;

    ImageView pagerImg;
    @Override
    protected void onCreate(Bundle savedInstanceState) &#123;
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_image);
        pagerImg = (ImageView) findViewById(R.id.pager_img);
        Intent intent = getIntent();
        Bundle data = intent.getExtras();
        ImageLoader.getInstance().displayImage((String) data.get(&quot;url&quot;),pagerImg);
    &#125;
&#125;  
</code></pre>
<h5 id="5-1-附上ImageActivity的布局文件"><a href="#5-1-附上ImageActivity的布局文件" class="headerlink" title="5.1 附上ImageActivity的布局文件"></a>5.1 附上ImageActivity的布局文件</h5><pre><code>&lt;RelativeLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
                xmlns:tools=&quot;http://schemas.android.com/tools&quot;
                android:layout_width=&quot;match_parent&quot;
                android:layout_height=&quot;match_parent&quot;
    &gt;
    &lt;ImageView
        android:id=&quot;@+id/pager_img&quot;
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;match_parent&quot;
        /&gt;
&lt;/RelativeLayout&gt;  
</code></pre>
<h4 id="最后-总结"><a href="#最后-总结" class="headerlink" title="最后 总结"></a>最后 总结</h4><p>通过在MyApplication中进行参数配置,做了内存缓存和硬盘缓存,当手机上图片正常显示,说明已缓存.          </p>
<p><img src="http://images.wxyass.com/wxyass/images/20170706154902.png">  </p>
<p>此时即便没有网络,图片也能正常显示.   </p>
<p>缓存策略的流程就是：<br>每次加载图片的时候都优先去内存缓存当中读取，当读取不到的时候则回去硬盘缓存中读取，而如果硬盘缓存仍然读取不到的话，就从网络上请求原始数据</p>
<p><a target="_blank" rel="noopener" href="http://oss.wxyass.com/wxyass/demo/TPListViewByUil.rar">本文源码下载</a>  </p>
<p>参考:<br><a target="_blank" rel="noopener" href="http://blog.csdn.net/tyk0910/article/details/50375070">http://blog.csdn.net/tyk0910/article/details/50375070</a></p>

      
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